/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.drools.base.rule.accessor;

import java.io.Serializable;
import java.util.Iterator;

import org.drools.base.base.ValueResolver;
import org.drools.base.reteoo.BaseTuple;
import org.drools.base.rule.Declaration;

public interface DataProvider
    extends
    Serializable,
    Cloneable {

    Declaration[] getRequiredDeclarations();

    Object createContext();

    Iterator getResults(BaseTuple tuple,
                        ValueResolver valueResolver,
                        Object providerContext);

    DataProvider clone();

    void replaceDeclaration(Declaration declaration,
                            Declaration resolved);

    boolean isReactive();
}
